ACTT Workshop: Montana
January 26-28, 2004, Missoula, Montana
Appendix C (continued): Skill Set Reporting Forms
Structures Skill Set
|Structures Team Members|
|Ted Burch, FHWA - Montana
John Miller, FHWA - Montana
Joe Kolman, MDT
Jesus Rohena, FHWA
|William McEleney, NSBA
Gary Kalberg, MDT
Jerry Potter, FHWA
|Doug Edwards, FHWA FLDO
Bob Modrow, MDT
Mac McArthur, MDT
(Barriers, Skill Set Coordination, etc.)
- Use self consolidating concrete, high early strength concrete, require rapid curing of CIP members, use high performance concrete on bridge decks with contractor training, allow longer haul times, develop an end result concrete specification, require contractor QC/QA, and use a Maturity Meter for concrete monitoring.
- These changes would involve special provisions and spec revisions. Construction personnel would have to be on board with this.
- All structural components that can be prefabricated off site should be to allow for shorter construction time at the actual project site.
|Prefabrication Lead Time
- Provide lead-time in the contract scheduling to allow the contractor to prefabricate as many of the structural components as possible.
- Where possible, the structures should use standardized components, such as drilled shaft diameters, so that construction can go smoother and quicker.
|Bridge Contract Combination
- Let the bridge construction as one contract with many bridges so that the structures can be constructed as efficiently as possible.
|Jack & Bore
- Jack and bore the culverts and wildlife crossings into place so that disturbance into the traveling public is minimized.
|Off -Season Construction
- The structural construction at the project site should be accomplished in the winter/off-season when traffic is minimal.
- The contractor should be encouraged to share any innovative ideas he might have to expedite construction.
|RUC and VE
- Consider tying road user costs to the requirements of value engineering.
- Consider doing the SEIS portion of this corridor as a design/build project.
|Redesign Wildlife Overpass
- This structure should be redesigned to be more like the other structures in this corridor and let in the combined bridge project. We suggest MSE abutments with prestressed beams. If this is not done the foundation of this structure should definitely be reevaluated.
|Jocko Hollow Bridge
- Recommendations for this structure are to eliminate the phase construction of the structure and phase construct the approaches, possibly with reinforced temporary slopes, to minimize traffic disturbance. A full-depth prefabricated deck on prefabricated caps should be used. The columns should be the same size as the drilled shafts on which they sit and these diameters should be standardized to no more than two different diameters. The 20' rock sockets on the drilled shafts need to be reevaluated. Consider providing the contractor the option of using a full depth precast deck.
|MRL Railroad Overpass
- A full-depth prefabricated deck should be used. The columns should be the same size as the drilled shafts on which they sit and these diameters should be standardized to no more than two different diameters. The wing walls for this structure should be squared up with a drilled shaft under them. Consider providing the contractor the option of using a full depth precast deck.
Notes recorded, but not entered into form:
- Can any of the bridges be grouped into a single construction contract?
- Top down construction for short bridges.
- Prefabricate everything.
- Cast deck on girders and then erect shallow superstructures.
- Jack and bore the small wildlife crossings.
- Temporary detour bridges on offset alignments.
- Prefabricated caps.
- Sequence so as to reuse temporary structures.
- Standardized detour structures & work bridges (early permits).
- Build the new structure adjacent to the old one and roll it in.
- Build over width and do half at a time.
- Build them long enough to facilitate permitting.
- Standard details as much as possible.
- Wildlife 200ft overpass, foundation needs to be revisited. Longer may be cheaper.
- Just make it a bridge and cover it with dirt.
- Build in winter for less traffic.
- Give the contractor a long lead time to allow for prefabrication and mobilization.
- State furnished materials.
- Incentive / disincentive for contract time and completion.
- Use lightweight concrete for shipping larger prefabed units.
- Expedite permits for oversized loads for hauling prefabed pieces.
- Use High performance concrete decks on all and provide training to contractors.
- Steam treat the cast in place for speed curing.
- Saline treatment specification should be modified to expedite construction using contractor innovation.
- Modify specs to encourage innovative ideas from contractor.
- Precast desk panels.
- Work from each end and top down to stay out of sensitive areas.
- Continuous decks regardless of number of spans.
- ? Integral Abutments?
- self consolidating concrete.
- high early strength concrete.
- pile bents.
- Drilled shafts rather than cofferdams.
- Develop a standard aesthetic treatment (rail).
- Precast aesthetic treatment.
- Staining preformed concrete stuff.
- Native artists to theme aesthetics.
- Maturity meter for concrete control.
- Con spans for long structures. (earth filled arch)
- Design build on SEIS part.
- Minimize MSE walls.
- Modify conc. Specs to allow for longer mud hauls and less moving of conc. plants. (end result spec to give contractor more freedom an mix design)
- Set up a plant.
- Bailey Bridge approach for temp structures.
- Ensure reliability and integrity of structure during design so they won't need to be worked on for a while.
- More contractor QC/QA.
- Integral wearing course and grind it for ride ability.
- Spread footings for simple spans.
- 10' X 22' openings for wildlife.
- Long bridge is continuous.
- Long structures must provide for wildlife passage.
- 12' clearance is for large structures.
- Same grade at pot holes pretty much.
Already Designed Bridges
- Jocko River Bridge - 15.6m wide, 3 spans, 120m long, 3 sizes of drilled shafts, staged construction, M72 Beam, full height abutments, 30° skew, int. bents 3 column pier cap.
- Multiple Bridges in one contract.
- Prefab caps.
- Full depth prefab decks.
- Eliminate phase construction.
- Phase approaches with reinforced slopes.
- Standard sizes/details (shaft diameters).
- Make all columns same size as shafts.
- No more than two sizes of drilled shafts.
- Continuous deck.
- Review need for 20' rock socket.
- Mission Creek Bridge - 16.5m wide, 1 span, 40m long, pipe piles.
- Wildlife overpass - 61m long, tunnel type deal, conspan, concrete end walls.
- MSE for end walls.
- Consider using a conventional bridge and cover it with dirt.
- MSE wall inside walls w/ spread footing abutments.
- Railroad Bridge - 103.5m long, 3 span, 13m wide, 30° skew, drilled shafts.
- Make all columns same size as shafts.
- Precast deck.
- Square and flat bottom of wing wall (add 1 drilled shaft).
- Include with Jocko Hollow Bridge.
Generic Findings and Recommendations
- Can multiple bridges be let in one contract.
- Jack and bore wildlife crossings and culverts.
- Prefabricate as many components as possible.
- Standardized details should be used where possible.
- Schedule letting so that construction occurs in the winter to avoid traffic and allow the contractor a long lead time to get prefabrication done.
- Modify specifications to encourage innovative ideas from the contractor. Consider tying RUC to VE. (get w/ innovative contracting).
- Design / build the SEIS section.
- Concrete Spec. Recommendations.
- Modify the concrete spec to allow longer haul times.
- Modify the concrete spec to be a end result spec with a contractor mix design.
- More contractor QC/QA.
- Require self consolidating concrete on some elements.
- Require high early strength concrete.
- Require the use of a maturity meter for concrete monitoring.
- Require fast curing on CIP members.
- Require HPC decks and provide training to the contractors.
- We think the wildlife overpass should be completely redone.
- The 20' rock sockets need to be reviewed.
- Intermingling with Environmental, Joe: permits, draining potholes, Equip in crossings, changing animal overpass.
- Likes idea of changing critter structure too, concerns: Jocko river and Mission creek timing restriction (only time work in stream is allowed is June 1 to August 31), erosion control is very important on the smaller drainages, likes permitting temporary facilities ahead of time.
- Intermingling with Geotechnical, Bob: jet grouting, welded wire wall, top-down bridge construction, jack and bore, ardulite, is scour an issue with it, draining potholes, changing critter overpass.
- Drilled shaft wet construction to keep from draining potholes, told us how jet grouting worked, look at rock sockets again, let contractor know what he is getting into.
- Intermingling with Innovative Contracting, Ted: design build, VE clauses for items beyond cost, qualifications based contractors prior to bid.
- VE, they are considering it.
- Intermingling with Construction, Gary: contract sequencing N to S or S to N, VE for traffic control and sequence of operations, combining of contracts, electronic data transfer.
- Traffic disturbance with critter overpass, likes combining projects, likes night work for lane closures, likes idea of changing critter structure.
- Intermingling with Utilities/ROW, Bill: utilities on bridges.